lemon-scented gum (eucalyptus citriodora hook.) is an important aromatic tree species, cultivated in different parts of the world for the production of citronellal-rich essential oil from its leaves. in present study, essential oils derived from leaves, flowers and fruits of the plant were investigated and compared in detail using gas chromatography/flame ionization detector (gc/fid) and gc/mass spectrometry (gc/ms). altogether, sixty-nine constituents, representing 92.9-97.5% of the total oil compositions were identified. leaf oil was represented by citronellal (86.0%), as the chief constituent. flower oil was dominated by citronellal (34.9%), -pinene (22.0%), citronellol (11.9%) and -pinene (4.6%), while the fruit oil contained -pinene (40.7%), -terpinene (11.8%), citronellal (7.1%) and p-cymene (6.5%) as major components.